Einfluss intramolekularer Bewegungen auf die Fluoreszenzquantenausbeute

Influence of intramolecular movements on the fluorescence quantum yield. The conditions determining the influence of the movements of different parts of molecules on the fluorescence quantum yield are shown. In the following we discuss four types of intramolecular movements that can help attain the desired fluorescent properties. In the case of methinecyanine dyes such intramolecular movements are responsible for the strong dependence of the fluorescence quantum yield on the solvent viscosity we have observed.